Two negative charges, Q = -20 uC are placed on the x-axis at x = +0.15 m and x =

Question

Two negative charges, Q = -20 uC are placed on the x-axis at x = +0.15 m and x = -0.15 m. How much energy does it take to assemble these two charges? You place an unknown charge on the y-axis at y = 0.3 m and find that the electric potential is 0 V at the origin. What is the unknown charge? If you place a -2 charge at the origin, what is the x-component of the force on it from the other three charges? If you place a -2 charge at the origin, what is the y-component of the force on it from the other three charges?

Explanation / Answer

a) work done for the assembly=K*Q1*Q1/R=12 J

b) to tal potential at the origin=-Kq1/0.15-Kq2/0.15+Kq3/0.3=0

q3=2*20*0.3/0.15=80 uC

c) x-component of force=0

c)y-component of force=o

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